|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Coupling Experiments and Modeling to Understand Plasticity and Failure
||On the Role of Casting Pores in the Fatigue Damage Process of a Cast Aluminium Alloy
||Marcel Wicke, Martin Luetje, Inigo Bacaicoa, Angelika Brueckner-Foit
|On-Site Speaker (Planned)
Fatigue failure of cast components is typically caused by cracks initiated at internal defects as the surface region is defect free. Although this effect is well-known, systematic investigations are rare due to the tremendous efforts associated with sample production and preparation. Here, we present such a systematic investigation on an Al-Cu-Si alloy. Specimens were manufactured by die-casting without additional machining to analyze the role of casting pores during fatigue damage process in detail. More specifically, the three-dimensional morphology and spatial distribution of these defects was determined using X-ray computed tomography (µ-CT). Reconstruction shows that complex-shaped shrinkage pores are typically accompanied by high numbers of regular-shaped gas pores. Fatigue tests performed subsequently indicate that usually multiple cracks are initiated from shrinkage pores and lifetime is reduced considerably if gas and shrinkage pores interact. These findings are confirmed by EBSD experiments and µ-CT analysis, which clearly give evidence for secondary internal cracks.
||Planned: Supplemental Proceedings volume